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Financial instruments - Fair value and risk management - Summary of derivative financial instruments (Details) - EUR (€)
€ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets € 109.8 € 352.8 € 346.7
Derivative financial liabilities (227.2) (182.1) (397.8)
Designated as continuing cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial liabilities (227.2) (182.1) (397.8)
Designated as continuing cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 109.8 325.9 346.7
Where hedge accounting is no longer applied      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets   26.9  
Less than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 94.4 349.5 292.1
Derivative financial liabilities (224.7) (178.0) (386.6)
Less than one year | Designated as continuing cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial liabilities (224.7) (178.0) (386.6)
Less than one year | Designated as continuing cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 94.4 322.6 292.1
Less than one year | Where hedge accounting is no longer applied      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets   26.9  
More than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 15.4 3.3 54.6
Derivative financial liabilities (2.5) (4.1) (11.2)
More than one year | Designated as continuing cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial liabilities (2.5) (4.1) (11.2)
More than one year | Designated as continuing cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 15.4 3.3 54.6
Foreign currency risk | Cash Flow Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 90.2 147.2 279.4
Derivative financial liabilities (2.7) (3.3) (48.0)
Net derivative financial assets (liabilities) 87.5 143.9 231.4
Foreign currency risk | Cash Flow Hedges | Property, plant and equipment - aircraft additions      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 373.8 518.1 2,305.5
Foreign currency risk | Cash Flow Hedges | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 5,066.7 4,125.4 4,771.0
Foreign currency risk | Cash Flow Hedges | Less than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 84.4 144.0 226.2
Derivative financial liabilities (0.2)   (44.9)
Net derivative financial assets (liabilities) 84.2 144.0 181.3
Foreign currency risk | Cash Flow Hedges | Less than one year | Property, plant and equipment - aircraft additions      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 373.8 494.0 1,893.6
Foreign currency risk | Cash Flow Hedges | Less than one year | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 3,925.5 3,701.7 3,979.4
Foreign currency risk | Cash Flow Hedges | More than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 5.8 3.2 53.2
Derivative financial liabilities (2.5) (3.3) (3.1)
Net derivative financial assets (liabilities) 3.3 (0.1) 50.1
Foreign currency risk | Cash Flow Hedges | More than one year | Property, plant and equipment - aircraft additions      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount   24.1 411.9
Foreign currency risk | Cash Flow Hedges | More than one year | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 1,141.2 423.7 791.6
Interest rate risk | Cash Flow Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets     3.6
Interest rate risk | Cash Flow Hedges | Variable-rate instruments      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount     32.0
Interest rate risk | Cash Flow Hedges | Less than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets     2.2
Interest rate risk | Cash Flow Hedges | Less than one year | Variable-rate instruments      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount     16.4
Interest rate risk | Cash Flow Hedges | More than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets     1.4
Interest rate risk | Cash Flow Hedges | More than one year | Variable-rate instruments      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount     15.6
Commodity price risk | Cash Flow Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 19.6 205.6 63.7
Derivative financial liabilities (224.5) (178.8) (349.8)
Net derivative financial assets (liabilities) (204.9) 26.8 (286.1)
Commodity price risk | Cash Flow Hedges | Fuel and carbon operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 3,900.9 3,716.0 3,815.0
Commodity price risk | Cash Flow Hedges | Less than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 10.0 205.5 63.7
Derivative financial liabilities (224.5) (178.0) (341.7)
Net derivative financial assets (liabilities) (214.5) 27.5 (278.0)
Commodity price risk | Cash Flow Hedges | Less than one year | Fuel and carbon operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 3,424.5 3,713.8 3,504.5
Commodity price risk | Cash Flow Hedges | More than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 9.6 0.1  
Derivative financial liabilities   (0.8) (8.1)
Net derivative financial assets (liabilities) 9.6 (0.7) (8.1)
Commodity price risk | Cash Flow Hedges | More than one year | Fuel and carbon operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount € 476.4 € 2.2 € 310.5